Display screen or portion thereof with a graphical user interface



FIG. 1 is a perspective view of a display screen or portion thereof withgraphical user interface in accordance with the present invention, shownin a first embodiment on a tablet;

FIG. 2 is a front view thereof;

FIG. 3 is a perspective view of a display screen or portion thereof withgraphical user interface in accordance with the present invention, shownin a second embodiment on a monitor; and,

FIG. 4 is a front view thereof.

The broken line showing of a tablet in FIGS. 1, 2 and of a monitor inFIGS. 3, 4 illustrates environment of the claim. The remainder of thebroken lines illustrate portions of the display screen with graphicaluser interface. The broken lines form no part of the claimed design.

CLAIM The ornamental design for a display screen or portion thereof witha graphical user interface, as shown and described.